Excel 2007 : Formula using next above information

I have a situation where there is a list of numbers in a column. Most of the numbers are 0's but randomly throughout the list there cells with numbers in them. I have used a filter to show only the cells with numbers.

I have a formula beside these numbers which requires information from the previous number in the list. Before the formula would just grab information from the line above, but now that I have had to place all the zeros in with the data, Im not sure how to get the formula to automatically detect it needs to use the previous number in the list which is not a 0

Thanks in advance for your help